A surveyor carries a terminal device 200 and travels to a survey point preliminarily instructed. The surveyor obtains survey position information by using a GPS unit in the terminal device 200 at the survey point. The surveyor also photographs an object of a survey by using a camera in the terminal device 200 at the survey point. After completion of a series of surveys, the surveyor transmits survey results including the survey position information to an analyzing apparatus 100 by using the terminal device 200. The analyzing apparatus 100 determines reliability by using survey position information included in the survey results and carries out a predetermined analysis by using a survey result of high reliability. Consequently, a survey result of low reliability can be eliminated from objects to be analyzed.